A side effect of playing too much videogames. often accompanied with minor to moderate,but constant, pain. can last days even if gameing is discontinued also, pain not always restricted to one thumb. can be applied to a gamer regardless of the platform he\she is playing, but obvously derrived from the 8-bit NES days.

an 3-4 foot long sword, simular to a katana.
a nodachi(also odachi and no-dachi) usually had no compassion sword.
generaly the last weapon a samari would use,(first bow, then yari) but thanks mainly to anime and manga it was largely overglorifyed.